- handle $? "parsing" with POSIX module instead of with ad-hoc bit-shifts
(Thanks to RJBS for the idea and a bug report.)
- support perl 5.8 (tested with 5.8.9, probably works with others)
(Thanks to Andreas Koenig (ANDK@cpan.org) for noticing the
unnecessary 5.10 dep)

- convert to Dist::Zilla
- depend on a version of Event::Join that passes its tests with the newest Moose
(seems like the Testers install Event::Join and an old Moose,
then upgrade Moose, then run my tests. wtf!?)
- improve docs